# Is topological string theory a topological field theory?

Topological string theory comes from a topological twist (in the suitable spacetimes) of the sigma model defining it. Does the topological twist make the sigma model a topological field theory?

• $\uparrow$ Yes. – Qmechanic Nov 4 '16 at 12:07
• There are two questions above. The answer to the first is "Not necessarily", and the answer to the second is "Yes". – user1504 Nov 4 '16 at 12:09